Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f148c1fd4581e53…

MALICIOUS

PDF

75.6 KB Created: 2021-08-27 15:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f0f19e5919d6c75796ebcae8bfaf32c SHA-1: e62df223f2adbf32bef296d8121b868483ae408f SHA-256: 4f148c1fd4581e53a40b6bac88b08e1463ceaa49760eedff4c221dde67db97bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to obscure the true destination, and the ML classifier strongly flags it as malicious. The presence of a 'Password-protected archive handoff' heuristic suggests this PDF may be a lure to trick users into downloading a password-protected file, which is a common tactic for evading gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76ec2680f---49699703370.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6e79d34f---pusilusagowafupewoga.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607474d6e22c7---57328409211.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/74a5b84d5f75cf9c557dc5ee3a2fb645/39778659559.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/123463b130b1fd3ff51930459d48f4f4/55958335460.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/73910895034.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/44265247332.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/zivakasupikorixomojapawo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f31c7916207cb87a9e8818e40c7b4aa7/zuluribolubatebet.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/38773157302.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/62192692749.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e1db8792d8d74d513ea157471b63390c/89638134051.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tbli9oq4aluvl35jsc9tnq0bar/sekev.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e0b4c964---vebopemowenijode.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608706f9b3a3f---watomabi.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609424b7725b6---32341378626.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/28126939880.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1bfe99c0---8953014951.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87dcac67e2---13027237731.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/1340316900.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/98754629183.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210816012750.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/23781607233.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/51528960308.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/94352628738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=i+will+sing+with+the+spirit+rutter+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e6afebb43aeda8670dac5b750cfd33f6/43980328862.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC358 17252 bytes
SHA-256: 8a3080a67be4980b4398133331534dd82c72331c26b5b5aefbeced326ee7c6ec
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10632 bytes
SHA-256: 8184d0a8086a018a44a31107d735590ec42b166819ef681efee0be745a660aef
font_02_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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